Update README.md

Author: paolomoz

README.md

@@ -1,4 +1,23 @@
-aem-samples
+AEM Samples
 ===========
-
 Code samples, best practices, exercises, tutorials. Just too little to be in their own repo. (help them grow up ;)
+
+What to contribute to this repository
+-------------------------------------
+If you have a small piece of code, a micro project or just a best practice you want to share, but it's too small to be in its own repository, you can push it here.
+
+How to contribute
+-----------------
+Just push your code/project in a top level folder. Please don't forget to provide a great README specific for you mocro project to properly describe it and let others know how they can use it or let it grow.
+
+Can a micro project be extracted in a new repostory?
+----------------------------------------------------
+Yes. With <code>git subtree</code> it is possible to extract any folder from this repository and to transfer it to a new repository, keeping its history safe so you don't break the communication.
+
+When does your project need its own repository?
+-----------------------------------------------
+* when it provides a well defined and unique extension/best-practice use case
+* when it is engaging more than 1 active contributors (so communication doesn't get mixed with other micro projects)
+* when it needs its own issue tracker or wiki
+* When it needs its own continuous integration
+* when you think it's time for it